The conduction conditions of the thyristor are: applying a forward voltage and having a triggering current at the gate; Its derivative devices include: fast thyristors, bidirectional thyristors, reverse conduction thyristors, light controlled thyristors, etc. It is a high-power switching semiconductor device, represented by the letter "V" and "VT" in the circuit (represented by the letter "SCR" in the old standard). Thyristor is a switching element that can operate under high voltage and high current conditions, and its working process can be controlled. It is widely used in electronic circuits such as controllable rectification, AC voltage regulation, contactless electronic switches, inverters, and frequency converters. It is a typical device for controlling large current with small current
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